Robtex

Up: 216.166.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.166.16.0/25
Down right: 216.166.16.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.166.16.1	PTR	216-166-16-1.fwd.datafoundry.com
216.166.16.13	PTR	216-166-16-13.fwd.datafoundry.com
216.166.16.36	A+PTR	ironport.arthrocare.com
216.166.16.38	PTR	216-166-16-38.fwd.datafoundry.com
216.166.16.38	A	wmail.arthrocare.com
216.166.16.42	A+PTR	216-166-16-42.fwd.datafoundry.com
216.166.16.42	A	connect.arthrocare.com
216.166.16.42	A	www.arthrocare.com
216.166.16.43	A	nucleoplasty.com
216.166.16.44	A	devicereimbursement.com
216.166.16.46	A	arthrocarelabs.com
216.166.16.47	PTR	216-166-16-47.fwd.datafoundry.com
216.166.16.47	A	arthrocare.dk
216.166.16.47	A	arthrocareinternational.com
216.166.16.51	A+PTR	smtp.arthrocare.com
216.166.16.51	A	smtp2.arthrocare.com
216.166.16.51	A	216-166-16-51.fwd.datafoundry.com
216.166.16.77	A+PTR	216-166-16-77.fwd.datafoundry.com
216.166.16.86	A+PTR	216-166-16-86.fwd.datafoundry.com
216.166.16.86	A	cfabogados.com
216.166.16.86	A	venio.com.mx
216.166.16.87	A	cloud-mall.com
216.166.16.87	A	bar-code.mx
216.166.16.101	PTR	pdfcomplete.com
216.166.16.101	A	ondocs.com
216.166.16.101	A	www.pdfcomplete.com
216.166.16.103	A	support.pdfcomplete.com
216.166.16.105	PTR	216-166-16-105.fwd.datafoundry.com
216.166.16.109	PTR	216-166-16-109.fwd.datafoundry.com
216.166.16.111	A	srv10.pdfcomplete.com
216.166.16.121	A	mail.pdfcomplete.com
216.166.16.132	PTR	216-166-16-132.fwd.datafoundry.com
216.166.16.132	A	srv11.pdfcomplete.com
216.166.16.134	A+PTR	216-166-16-134.fwd.datafoundry.com
216.166.16.163	A+PTR	mail2.costep.org